As soon as the interstitial fluid enters the lymph capillaries, it is called lymph. Returning the fluid to the blood prevents edema and helps to maintain normal blood volume and pressure.

Does lymph forms from interstitial fluid?

Since the lymph is derived from the interstitial fluid, its composition continually changes, because the blood and the surrounding cells continually exchange substances with the interstitial fluid. It is generally similar to blood plasma, which is the fluid component of blood.

How does interstitial fluid moves into lymphatic capillaries?

Transport in the Lymph Capillaries and Vessels

The fluid accumulates in the interstitial space inside tissues after leaking out through the cardiovascular capillaries. The fluid enters the lymphatic capillaries by leaking through the minivalves located in the junctions of the endothelium.